Diaphragm fuel pump



Aug'. 31, 192e. 1,597,689

- J. L. L. A. A: MOULETl DIAPlmAGM FUEL PUMP Filed July 9, 1918 /v V FNT9R- Jig., LLAA/moule# Patented Aug'. 31, 1926,.

FFICE.-

JEAN LOUIS LON ALBERT HOULET, 0F PARIS, FRANCE.

DIAPHRAGM FUEL PUMP.

.Applwation :lied July 9, 1918, Serial No. 244,128, and in France June (GRANTED UNDER THE PROVISIONS 0E THE AUT 0F IABGH 3, 1921,41 STAT. L., 1313.)v

My invention relates to an improved re lating pump applicable to aerial machlne motors.

In aerial machines and particularly in aeroplanes, in order to pro-vide for the proper balancing of parts it is necessary that the supply of fuel should be placed below the carbureters of the motor requiring to be fed. This -is particularly the case for aeroplanes having an extensive range of action on account of the heavy wei ht of fuel which it is necessary to carry. he result is that the fuel must. be raised as fast as it is lisedby means of an auxiliary part actingas a pump.

The accompanying drawing which fully illustrates my. invention shows a sectional plan of my improved regulating pump.

My improved regulating pump consists of 'an outer envelope or casing a an inner envelope b and framework forming a gear case y'. 'I his envelope b has a convex end and is provided with folds so as to be collapsible and extensible, and thussubject to deformation by elasticity in a direction perpendicular to the folds.

The liquid circulates between these two envelopes or casings which/'are connected 1n such a manner as to be thoroughly watertight. Upon the outer envelope are mounted two valvechests containing one a clack valve f opening in the direction of' suction and the other a similar clack valve m opening in the forcing out sense. The inlet valve fis connected to themain fuel -tank which will usually lie on a1 level below that of the carbureter and the outlet valve m is connected to the constant lever fuel tank of the carbureter.

A sliding rod al is screwed centrally at the convex end b1 of the envelope b in a sleeve b2 and is guided in a longitudinal sense, this rod being moreover recessed or hollowed out at e. The spring g is held at one end by the tension regulatin device It and' at the other by the hub of the gear case j while it is coiled aroundthe sliding rod d. This s ring which is suitably tightened has a tendency of maintaining theA contact between the rear part of the recess e and yournaled cam, whose journals turn in bear' lngs formed integrallb with the fixed art of the apparatus. otion ismparte to an eccentric'ally the cam z' by a helicoidal with the worm t keyed on of the machine.

The pump operates as follows: as the cam turns in the direction indicated by the arrow the connecting displaced for half a turn, the spring g is stretched the envelope b collapses, and the suction of the liquid takes place between the two envelopes a and b. As the cam z' conpinion a gearing the motor shaft HEISSUED rod is longitudinally tinues to rotate for another half turn, the

spring g is distended and pushes the connecting rod in an opposite direction, the envelope b returns to' its former position and the liquid is now forced out. The pump supply operated in the manner aforesaid is supposed to exceed the carbureters consumption, the sucked up fuel lgradually chokes the pump as the forcing out is incomplete, by reason of the incompressibility of the liquid, the spring is gradually/,tightened 4and the deformation of the envelope b increases. The cam i breaks contact with the rod which ceases to have any effect on the suction lmtil normal conditions prevail anew. The stroke corresponding to the feed is thus automatically regulated however such feed may vary.` The gear case y' forming the framework conta-ins all the moving parts and may be kept filled with oil.

lHaving now described myinvention what I claim as new and desire to secure by Letters Patent is: v

1. A diaphragm fuel pump, comprising in combination, an outer valve on said envelope adapted to be connected to a fuel suppl an outlet valve on said envelope adapted to be connected to the constant -level fuel tank of a carbureter, an inner collapsible and extensible envelope forming a liquid-tight joint with the outer comprising an outer envelope, an inlet envelope, an inlet envelope a sliding4 rod tothe inner collapsi le i an` eccentric cam envelose, adapted to positiv move. said rod in the direction correspon g to suction, a s118411? carryin lsaid eccentric cani, a-worm wheel on sai shaft, a worm in '-mesh'fwith the worm wheel, a shaft carrying said worm, an

oil-ti t gearcase in which the sliding rod and s afts are supported and containing the eccentric cam and worm gearing, and elastic means .adapted-to ible enve oein the opposite direction.

3.-In a 'apliragm fuel pump, the combinationA of an outer envelope carrying two valve chests containing each a clack valve for the suction and forcin out of fuel respectively, an, inner 'collapsi le and extensible 'envelope forming a water tight joint with the framewor forming a gear case, a longitudinal sliding rod guided said gear case, an eccentrically journaled in combination, a pump jcasin ing its pressure stroke.

.-, operatively connecte. 1

consumin elements of the en 5. In a fuel-feeding combination, a easing adapted'to'be to thesource of fuel vand the fuel gine, an expans'ible an colla sible wall in said casing, means to positive y actua-te said wall in one direction to prov-idea suction stroke, and resilient means coacting. with said wall the movement of the same in .the

'opposite direction -to provide 'apressure stroke.

e. in a* fuel-feeding system for engines, is

' a combination, apum casing adaptedto be Aand the fuel gine to the source of fuel consuming elements of the ena flexible wall in said casing, and means comprising an engine-driven element operative to flex said wall in one direction operatively connec return the innerV c0llaps el consuming elements of the member in said-- member in produc.

systemfor engines, in J only, 'lilil am.,

rection bythe force of b.A-fuelfeeding system ione es com a um V adapted tob P P carburetor for supplV bureter of said e member in s mi to ssd cm said casing, and means whereby said member makes its pressure stroke b the.

force of resiliency to vary the supply o fuel automatically Dwith the ywithdrawal of fuel `from said carbureter.l

Y P 9381118 operatively connected with the nguie, ailexible pumping -8. A'pump comprisiug-'iiiicombinationa flexible member, means for moving said member itively to provide aV suctionstroke, an resilient means coacting with `said member in movinsaidemember on its y the pressure stroke, where length of said stroke is determined by the pressure on the iiuid being pumped thereby.`

9. In a fuel-feeding system for engines, a

ump casing adapted to be operatively connected with the source of fuel andlt consuming elements, apump within said casing for supplying fuel to said elements and comprising a iexiblepumping member and actuatin means for the same so related he fuel thereto t at said member may move with respect to said means in response vto pressure variations in the fuel being pumped thereby.

10. In a fuel-feeding system in combination, a pump cas' vbe' operativel connected to ve source. of fuel and the el consuming elements, a ilexible member in said'casing, means for positienr stroke, said member beingY movable with respect to pressure ofi-the toprovide its pressure stroke.

i1. vA fuelceding comprising means adapted to be: operatively for engines, Aadapted to' tively flexing said member to prov'ide asnosystem -for engines said means in response-tothefuel, and resilient means.co-'- acting with saidmember in moving thesame connected with' a source of'fuel, fuel conf f s'uming elements for pumpingl fuel from Y said source' tosaid elements, means comprising a flexible member. having a stroke which varies automatically to maintain a redetermined sulply of -to said elements. 1 testimony name to this specification.

" Juu'iouis Lion iu-.xmms iusnr'fiiouisi.

pressure on the whereof i have signed my said pumping ioo 

